@article{oai:barrel.repo.nii.ac.jp:00000240,
 author = {澁谷, 浩},
 issue = {2/3},
 journal = {商学討究},
 month = {Dec},
 note = {Most social scientists, especially economists, believe that altruists do not exist because they cannot survive exploitation by egoists. An agent-based model demonstrates, however, that altruists can survive natural selection if society comprises four types of individuals: altruists, reciprocal altruists, egoists and reciprocal egoists. These individuals are characterized by different combinations of two phenotypes: general trust and social intelligence. In a society of four types of individuals, coevolution of general trust and social intelligence will emerge. Coevolution constitutes a new mechanism of the emergence of cooperation. If coevolution is strong, altruists will be able to survive and help society evolve into a high-trust and high-growth society. Without altruists, coevolution does not work and society fails to grow. Thus society needs altruists.},
 pages = {169--194},
 title = {Does Society Need Altruists? Coevolution of General Trust and Social Intelligence},
 volume = {64},
 year = {2013}
}